Electric shaving device



July 11, 1939.l v. ARoNsON 2,166,035

ELECTRIC SHAVING DEVICE Filed Dec. 20, 1957 Patented July 11, 1939 `UNITED STATES PATENT oFFl'cE 8- Claims.

The invention relates to electric shaving devices of the type usable without lather and has as an object the provision of a device of this character that will give an exceptionally close shave.

n It is a further object of the invention to provide a device of this character that can be moved in any direction relative to the cutting element upon the face of the user.

It is a further object of the invention to provide l a device that will provide a desirable massaging effect in use. It is a further object of the invention to provide a device of thischaracter having an especially convenient angle with the handle provided l without the use of universal joints in the drive shaft.

Itis a further object of the invention to provide a device of this character that may be driven with an oscillatory motion or with a pure rotary motion by a slight change in mechanism.

It is a further object of the invention to provide a device of this character which is very easily cleaned, having ample escape for clipped hairs.

It is a further object of the invention to provide a shaver which may be adjusted for closeness of shave.

Further objects of the invention will appear from the following description when read in connection with the accompanying drawing showing illustrative embodiments of the invention, and wherein:

Figure 1 is a central verticalsection through the head of the shaving device;

Fig. 2 is a view from the right of Figure 1;

Figs. 3, 4, and 5 are sections on the corresponding section lines of Figure 1;

Fig.- 6 is a detail section on line 3-3 of Fig. 1 showing a dierent form of the invention;

Fig. '1 is a detail section on line 5--5 of Fig. 1

40 showing the form of Figure 6;

Fig. 8 is a detail section corresponding to a portion of Figure 3 showing a still further -form of a detail ofthe mechanism.

As shown the invention is embodied in the head I0 of a shaving device shown as removably supported by a handle. Il, which handle in accordance with the usual practice, houses a motor, not shown, driving a motor shaft l2.

The head l0 may be retained in the handle II 50 by means of a set screw I3 in accordance with the usual practice. Having telescopic connection with the motor shaft I2 and driven by pin I4 from said shaft, there is shown an extension shaft I5 formed with a drive worm I6.

u The head Il! is shown as formed with a -ring member I1 carrying a bearing I8 for the end of the shaft I5 and screwthreaded as at I9 at its periphery for engagement with a'ring 20 having an annular inwardly extending fiange2l to retain a shell 22 in engagement with the edge of the 5 ring I1. I

The shell 22 is shown as formed withl an upstanding ring 23 terminating in guard posts 24A. A portion of the shell 22j is also in the form of a diaphragm 25 having a recessed portion 26 and l0 an inwardly open sleeve portion 21. A hollow stud 28 is shown having a reduced portion 29 standingwithin the sleeve portion 21 anda shoulder 30 seating upon the bottom of the recess 26. Retained upon the head of the stud 28, there is 15 shown a shear plate 3| held by means of a cap screw 32 screwthreaded at its lower end for reception of a nut 33, a washer 34 being desirably provided to take the friction of rotation of the nut 33. Revolubly engaging the exterior of the hol- 20 low stud `28, there is shown a sleeve portion 35 of the cutter 36.

The shear plate 3I is shown as formed with teeth 31 upon its edge and the cutter member 36 with coasting teeth 38. To provide for a shearing cut as distinguished from a pure nipping ac' tion, the teeth 31 are formed by radial slots and the teeth 38 by cuts parallel with tangents to the circle of the cutter edge, producing the sharp angles between the coacting cutting edges indicated inFigure 5. The slots between the teeth 31 are shown in alignment with the spaces between the guard posts 24. Y

To drive the cutter 36 there is shown/a drive shaft 39 mounted in a sleeve 40 carried by a split 35 ring 4I clamped by means of a screw 42 upon the exterior of the sleeve portion 21 of the shell 22. The drive shaft 39 has pinned thereto aA drive pinion 43 in mesh with the worm I6, the remaining end of the shaft 39 carrying a disk 44 eccentricaliy mounted upon which is a roller 45 working in a slot 46 carried by an arm 41 mounted upon a ring 48 fixed rigidly upon the sleeve 35.

As the pinion 43 is revolved carrying with it the shaft 39 and the eccentric roller 45, an oscil- 45 latory motion will be imparted to the cutter 36. It is obvious that the ring 48 may have substituted therefor a ring gear 49, Figures 6 and 7, and that in place of the disk 44 and roller 45, a pinion 50, Figures 6 and 7, may be substituted whereupon 50 the cutter 36 will be driven by a pure rotary motion instead of by an oscillatory motion.

As shown in Figure 8, the portion 22 of the shell maybe made integral with the ring l1 and the ring 23 engage the screwthreads upon mem- .s

ber l1, in which case a. lock ring 52 is provided and with this structure the guard posts 24 may be adjusted for height relative to the teeth 31, 38 whereby the closeness of shave secured by the device may be readily varied.

To prevent dust and clippings gaining access to the mechanism, a shield disk 53 is shown as securedto ring 48 and arm 41. Openings 54 in ringv 23 permit escape of clippings which maybe expelled by blowing into the openings at one side.

The movable cutter plate 35 is formed with a recess at which it bears upon the ange of hollow stud 28. To press the cutter plate toward the shear plate and against said flange a spring 55 is shown. Desirably the shear and cutter plates are maintained out of actual contact, being separated less than the thickness of a hair. By this structure all wear will come upon the recess in the cutter plate and the ange of stud 28.

Since the teeth project in all directions in the preferred form of the invention, the cutter head may be moved in any'direction. A circular motion in contact with the skin is found veryeffective and affords a desirable massaging effect.

'I'he fact that the teeth upon the cutter plate are triangular and the sides of the teeth on the shear plate are radial provides a slight angle between the coacting cutting edges, giving a scissors action combined with a sliding cut found to be very effective.

The oscillatory form of the device divides the wear between the oppositely facing edgesof the teeth. The rotary form may be driven at a higher rate of speed and should be more operation.

Ii*v desired radially projecting flns 55 may be provided on the periphery of sleeve 35 to provide a fan action to expel severed portions ofthe beard or hair through the openings 5I. In the absence of such fins collected hairs may be readily blown.

out of said openings by the breath of the user.

Minor changes may be made in the physical embodiments of the invention within the scope of the appended claims without departing from the spirit thereof.

I claim: Y

1. A shaving device comprising, in combina# tion: a cutter head; a drive shaft projecting thereinto; a Worm gear carried by vsaid shaft; a countershaft mounted in said head; a pinion on said countershaft having teeth parallel with its axis and in mesh with the thread of said worm gear, whereby the axis of the countershaft is at an angle other than to the axis of said drive shaft; a circular shear plate mounted on said cutter lhead formed with radially projecting peripheral teeth; a circular cutter plate formed with peripheral teethunderlying said -first named teeth; and means to' drive said cutter plate about its axis by revolution of said'countershaft.

2. A shaving device comprising, in combinaf tion: a circular disk-like shear plate; means to rigidly support said plate at its central portion; said plate formed with radially projecting peripheral teeth; a. cutter plate disk formed with radially projecting peripheral teeth underlying the ilrst named teeth; means to cause movement quiet in of said cutter plate labout its axis; a ring enclosing said cutter plate and formed with spaced guard posts projecting parallel with the axis of said plates beyond the plane of coaction of the "said teeth; and means to adjust said ring axially to vary the closeness of shave resulting from coaction of said teeth.

3. A shaving device comprising, in combination: a hollow casing; a supporting member spanning the interior thereof; a support rigid with said member; a circular shear plate secured upon said support; a cutter plate; a sleeve surrounding said support and secured to said cutter plate; a drive shaft projecting into said casing with its axis coplanar with the axis of saidsieeve; a countershaft journaled in said casing with its axis offset from said common plane; means to drive said countershaft from said driveshaft; and means to drive said sleeve from said countershaft.

4. The combination of claim 2 with said ring provided with openings for escape of severed hairs.

5. The combination of claim .2 with said ring provided with openings; and with a sleeve supporting and driving said cutter plates With fan blades carried by the periphery of said sleeve.

6. A shaving device comprising, in combination: a cutter head casing; a drive shaft projecting thereinto; a disk spanning the interior oi the casing; a bushing penetrating said disk and formed with a shoulder abutting the disk; a stationary cutter plate having teeth'on its periphery; a rod passing through said plate and bushing; screwmeans acting through said rod and plate to bind said shoulder against said disk; a sleeve revo'luble about said bushing carrying a cutter plate having teeth underlying said iirst named teeth; and means to drive said sleeve from said drive shaft.

7. The combination of claim 6 with said revoluble cutter plate formed with a recess; vsaid bushing with a shoulder abutting the bottom of said recess to hold the cutter plates from actual contact; and with spring means to urge the cutter plates toward mutual contact.

8. A shaving device comprising, in combina.- tion: a cutter head casing formed with a hollow cylindrical portion; a disk spanning said portion and formed with a central recess having a collar projecting therefrom; a bushing having a re duced portion extending into said collar providing a shoulder seating in said recess; a headed rod extending through said bushing; a stationary cutter plate mounted on said rod; screw means to clamp said cutter plate through said rod and bushing to said collar; a sleeve revoluble on said bushing; a. cutter plate carried bysaid sleeve underlying said stationary cutter plate; a shaft bearing clamped upon the exterior of said collar;

va countershaft mounted in said bearing with its axis parallel with the axis of said rod; means to LOUIS `V. ARONSON. 

